Creping paper



um. 19 192s. 1,603,932

-. E. H. ANGIER GREPING PAPER Filed Jan. 14, 1926 Patented a. 19, 1926.

UNITED STATES EDWARD H. GIER, OF FBAIINGHAM, MASSACHUSETTS.

CBEPING PAPER.

' Application filed January 14, 1926. Serial No. 81,189.

This invention relates to a method of pro ducing creped paper embodyinga layer of waterproofing material such, for instance, as asphalt. Itfinds particular application to the roduction of creped duplex papercomrising two paper layers cemented together y an interveningwaterproofing layer.

The invention will be well understood by reference-to the followingdescription of a preferred method of preparing a duplex paper inaccordance therewith when taken in connection with the accompanyingdrawing diagrammatically illustrating the same.

Duplex paper for wrapping and packing purposes consistin of two sheetsof substantial paper, suc for instance, as kraft paper, cementedtogether by a layer of asphalt, commonly the pitchy residue of petroleumdistillation, applied a in melted form is well known. Such paper may becreped by the roll and doctor crping process essentially as described inthe patent to Arkell, No. 790,021, granted May 16, 1905. For thispurpose a completed duplex paper 5 has been saturated thoroughly inwater, de-

posited on a crping roll and pressed into firm adherence thereto andthen crowded back on itself by a doctor blade cooperating with the rollwhich at the same time stripped the aper from the roll in ci'ped orcrinkled condition. In this process a very thorough saturation isnecessary to penetrate the paper and prepare it for the crpingoperatlon. In articular it is necessary to em y a hot ath both to assistthe saturation of the paper, since the sizing thereof resists thepenetration of moisture, and also to soften the solid asphalt layerbetween which has a certain stifiness and unless heated in this mannerwill not conform properly to the crping roll or be sutficiently fluid topermit the crping operation to be efliciently efl'ected. In thissaturation a part of the sizing of the paper is removed. V

In accordance with my invention I duplex and crepe paper as a continuousprocess. Water roofing material in a watery vehicle is app ied in fluidform to the paper which is immediately crped. Thus instead of coat- 05 aand as drawn from supply rolls and the paper with melted asphalt I mayutilize an emulsion prepared by mixing thepassing down between a pair ofhorizontally arranged rolls 3 and5 inface to face relation. Suitable endwalls 7 are placed near the ends of the rolls and define with theopposed cylindrical surfaces of the rolls a trough-like structure. Theasphalt emulsion in the form of a thick fluid, almost a paste inconsistency, may be delivered to this trough from a suitable containerdiagrammatically illustrated at 9 and is thus fed to the opposed facesof the webs a and 6 overlying the'sides of this trough. The spacing ofthe rolls 3 and 5 will accurately determine the amount of the emulsionwhich is thus introduced between the two layers of paper. Passing fromthe pair of rolls 3 and 5, the two webs a and b may then be passedthrough a air of squeeze rolls 10. These will cause t e two webs tocohere with considerable tenacity and will also assist in driving thewater which forms the vehicle of the asphalt emulsion into the paper. Anemulsion of this character is a mechanical mixture as distinguished froma solution and it seems probable that the paper blots out,

as it were, a certain amount of the moisture and that the pressure ofthe squeeze rolls may 5 ueeze some of the moisture out from the solidmatter in a way which may be figuratively compared to the squeezing ofwater from a sponge. In any event the compound web passing from thesqueeze rolls has considerable coherence and the paper is damp and in agood condition for crping.

The compound web may be moistened on the outside, as by means of acoating roll 11, to secure its proper adhesion to the crping roll and,if desired, this moistening may be effected by means of water containinsize or dextrin or like material having ad esive roperties. The web isthen led to the creping roll 13 against which it is firmly pressed by asqueezeroll 15 and is crowded back on itself while adhering to thecreping roll by means of the doctor blade in well known 1 manner. Thecrped duplex web is then dried in any suitable manner as indicated bythe diagrammatic showing of the drier 19 and may be 'rewound for use.

The asphalt emulsion may be prepared in any desired quantities andstored and diluted as necessary for use when desired. In the crpingprocess as described no heat need be employed, an expensive andoppressive feature of those processes in which the asphalt for thecrping operation.

is applied in a melted condition and in which hot water is required tosaturate the duplex paper. The layer of emulsion carried in the compoundweb ab to the creping apparatus has at that time no stifi'ness and heatis not necessary' to prepare it- It Wlll be noted that the prolongedsoaking of the paper in a saturating bath is done away with as moistureis introduced with the asphalt emulsion between the layers of the paper.When introduced in this manner it penetrates readily and may bedistributed through the body of the paper in the manner described.Probably a lesser amount of water is required properly to prepare thepaper for the crping operation but, certainly, the softening of thepaper by the crping operation in a uniform manner is more readily andconvenientlyeffected than in the case Where dry completed duplex paperis passed through a saturating bath. The crped product isdistinguishable from the product prepared by the old method, having amore leathery and tough appearance and feeling.

I have described in detail one particular method by which my inventionmay be practiced. Obviously the. details described are not essential tothe invention in its broader aspects but may be considerably variedwithout departing from the spirit of the invention.

What I claim as new and desire to secure by Letters Patent I shallexpress in the following claims:

1 A method of producing waterproofed creped paper which comprisesapplying waterproofing material in a watery vehicle to .the papersimultaneously to wet the same and to distribute the waterproofingmatenalthereover, crping the moist paper and drying the same to expelthe vehicle and to deposit the waterproofing "material.

2. A method of producing crped Waterproof duplex paper which comprisesintroducing between layers of paper waterproofing material in a watervehicle simultaneously to wet the paper and to distribute theWaterproofing material' thereover, creping the moist layers as one anddrying the same to expel the vehicle and to deposit the waterproofingmaterial.

3. A method of producing crped duplex paper which comprises duplexingtwo layers of paper with pitch suspended in a watery vehicle, crping theproduct while softened by such vehicle and drying the crped product.

4. A method of producing crped paper which comprises leading togethertwo paper Webs, pouring an asphalt emulsion between them, pressing themtogether, leading the connected webs directly to a crping apparatus anddrying the crped product.

5. A method of crping paper comprising applying to the paper a pitchemulsion both to provide a coating for the same and to soften it by themoisture of the vehicle, depositing the moist paperon a crping roll,crowding it back on itself while adhering to said roll and drying theresulting product.

'6. A method of crping paper comprising introducing a layer ofemulsified pitch between two layers of paper, pressing together thelayers to cause them to cohere and to assist the-wetting of the paper bysaid emulsion, causing the compound layer to adhere to a crping roll,crowding it back on itself while adherent thereto and drying the crpedproduct. 4

In testimony whereof, I have signed my name tothis specification.

EDWARD H. ANGIER.

